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How to bind a list-size to a label [message #1006843]

Sat, 02 February 2013 18:57

Jens Mayer

Messages: 19
Registered: September 2009
Location: Hamburg

Junior Member

Hi,

maybe this is a dumb question but I am stuck:

i want to bind the size of a WritableList to a label to show how many entries the list actually has.

The label-sided part of the Binding is easy, but I wonder how to create the IObservableValue for the size of the list...

Can anyone help me please?

Thanks in advance,

Jens

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Re: How to bind a list-size to a label [message #1008408 is a reply to message #1006843]

Tue, 12 February 2013 11:15

Nigel Westbury

Messages: 18
Registered: July 2009

Junior Member

Use a computed value. The model side of the binding would be:

new ComputedValue() {
protected Object calculate() {
return myWritableList.size();
}
};

Note that ObservableList.size() is a tracked getter (annotated with
@TrackedGetter and if you look at the implementation you will see it
calls getterCalled method).

Nigel Westbury

On 02/02/2013 18:57, Jens Mayer wrote:
> Hi,
>
> maybe this is a dumb question but I am stuck:
>
> i want to bind the size of a WritableList to a label to show how many
> entries the list actually has.
>
> The label-sided part of the Binding is easy, but I wonder how to create
> the IObservableValue for the size of the list...
>
> Can anyone help me please?
>
> Thanks in advance,
>
> Jens

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